import React, { Component } from 'react'
// 引入 store 用于获取状态
import store from "../../redux/store"
// 引入
import {createIncrementAction,createDecrementAction} from "../../redux/count_action"

export default class Count extends Component {
    // componentDidMount(){
    //     // 监测 redux 中的状态变化 只要变化 就调用 render
    //     store.subscribe(() => {
    //         this.setState({})
    //     })
    // }
    // 加法
    increment = () => {
        const {value} = this.selectNumber;
        store.dispatch(createIncrementAction(value*1))
        
    }
    // 减法
    decrement = () => {
        const {value} = this.selectNumber;
        store.dispatch(createDecrementAction(value*1))
    }
    // 当前求和为奇数再加
    incrementIfOdd = () => {
        const {value} = this.selectNumber;
        const count = store.getState();
        console.log(count)
        if(count % 2 !== 0){
            store.dispatch(createIncrementAction(value*1))
        }
    }
    // 异步加
    incrementAsync = () => {
        const {value} = this.selectNumber;
        setTimeout(() => {
            store.dispatch(createIncrementAction(value*1))
        },500)
    }
    render() {
        return (
            <div>
                <h1>当前求和为：{store.getState()}</h1>
                <select ref={c => this.selectNumber = c}>
                    <option value="1">1</option>
                    <option value="2">2</option>
                    <option value="3">3</option>
                </select>&nbsp;
                <button onClick={this.increment}>+</button>&nbsp;
                <button onClick={this.decrement}>-</button>&nbsp;
                <button onClick={this.incrementIfOdd}>当前求和为奇数再加</button>&nbsp;
                <button onClick={this.incrementAsync}>异步加</button>
            </div>
        )
    }
}
